[SPARKR][DOC] minor formatting and output cleanup for R vignettes
[SPARKR][DOC] minor formatting and output cleanup for R vignettes

## What changes were proposed in this pull request?

Clean up output, format table, truncate long example output, hide warnings

(new - Left; existing - Right)
![image](https://cloud.githubusercontent.com/assets/8969467/19064018/5dcde4d0-89bc-11e6-857b-052df3f52a4e.png)

![image](https://cloud.githubusercontent.com/assets/8969467/19064034/6db09956-89bc-11e6-8e43-232d5c3fe5e6.png)

![image](https://cloud.githubusercontent.com/assets/8969467/19064058/88f09590-89bc-11e6-9993-61639e29dfdd.png)

![image](https://cloud.githubusercontent.com/assets/8969467/19064066/95ccbf64-89bc-11e6-877f-45af03ddcadc.png)

![image](https://cloud.githubusercontent.com/assets/8969467/19064082/a8445404-89bc-11e6-8532-26d8bc9b206f.png)

## How was this patch tested?

Run create-doc.sh manually

Author: Felix Cheung <felixcheung_m@hotmail.com>

Closes #15340 from felixcheung/vignettes.

setjet/spark,LantaoJin/spark,liutang123/spark,wangyum/spark,apache-spark-on-k8s/spark,tengpeng/spark,lvdongr/spark,setjet/spark,brad-kaiser/spark,setjet/spark,ioana-delaney/spark,actuaryzhang/spark,UndeadBaneGitHub/spark,JerryLead/spark,jianran/spark,eyalfa/spark,metamx/spark,1haodian/spark,poffuomo/spark,zhouyejoe/spark,ioana-delaney/spark,ConeyLiu/spark,milliman/spark,mdespriee/spark,mahak/spark,kissmetrics/spark,rikima/spark,apache/spark,hvanhovell/spark,kevinyu98/spark,xuanyuanking/spark,jlopezmalla/spark,bravo-zhang/spark,adrian-ionescu/apache-spark,shuangshuangwang/spark,saturday-shi/spark,witgo/spark,HyukjinKwon/spark,rezasafi/spark,techaddict/spark,jiangxb1987/spark,ueshin/apache-spark,akopich/spark,mahak/spark,narahari92/spark,ron8hu/spark,caneGuy/spark,mike0sv/spark,saltstar/spark,milliman/spark,zzcclp/spark,patrick-nicholson/spark,kevinyu98/spark,byakuinss/spark,gengliangwang/spark,ueshin/apache-spark,saltstar/spark,rekhajoshm/spark,lvdongr/spark,ptkool/spark,caneGuy/spark,sureshthalamati/spark,darionyaphet/spark,UndeadBaneGitHub/spark,Panos-Bletsos/spark-cost-model-optimizer,pgandhi999/spark,rednaxelafx/apache-spark,ddna1021/spark,MLnick/spark,actuaryzhang/spark,andrewor14/spark,shuangshuangwang/spark,ron8hu/spark,dhruve/spark,ueshin/apache-spark,rekhajoshm/spark,goldmedal/spark,gengliangwang/spark,janewangfb/spark,andrewor14/spark,mzl9039/spark,kevinyu98/spark,facaiy/spark,shuangshuangwang/spark,shubhamchopra/spark,nchammas/spark,liyichao/spark,jiangxb1987/spark,ibm-research-ireland/sparkoscope,wangmiao1981/spark,mahak/spark,mdespriee/spark,skonto/spark,cloud-fan/spark,michalsenkyr/spark,nilsgrabbert/spark,liyichao/spark,ajaysaini725/spark,metamx/spark,icexelloss/spark,dbtsai/spark,loneknightpy/spark,adrian-ionescu/apache-spark,tengpeng/spark,ioana-delaney/spark,kissmetrics/spark,shuangshuangwang/spark,nilsgrabbert/spark,michalsenkyr/spark,Aegeaner/spark,hhbyyh/spark,map222/spark,akopich/spark,witgo/spark,someorz/spark,goldmedal/spark,kevinyu98/spark,shuangshuangwang/spark,alunarbeach/spark,JoshRosen/spark,gengliangwang/spark,nilsgrabbert/spark,chuckchen/spark,eyalfa/spark,sureshthalamati/spark,debugger87/spark,xuanyuanking/spark,dongjoon-hyun/spark,rezasafi/spark,wangmiao1981/spark,zero323/spark,jianran/spark,ptkool/spark,BryanCutler/spark,bdrillard/spark,zhouyejoe/spark,holdenk/spark,hhbyyh/spark,wzhfy/spark,WindCanDie/spark,bravo-zhang/spark,minixalpha/spark,ibm-research-ireland/sparkoscope,dhruve/spark,JoshRosen/spark,setjet/spark,map222/spark,kimoonkim/spark,goldmedal/spark,dhruve/spark,tengpeng/spark,brad-kaiser/spark,zzcclp/spark,tejasapatil/spark,narahari92/spark,aokolnychyi/spark,metamx/spark,mike0sv/spark,milliman/spark,dbtsai/spark,hhbyyh/spark,esi-mineset/spark,WeichenXu123/spark,aokolnychyi/spark,UndeadBaneGitHub/spark,UndeadBaneGitHub/spark,michalsenkyr/spark,cloud-fan/spark,adrian-ionescu/apache-spark,mahak/spark,holdenk/spark,vinodkc/spark,ibm-research-ireland/sparkoscope,liyichao/spark,srowen/spark,akopich/spark,actuaryzhang/spark,eyalfa/spark,srowen/spark,bdrillard/spark,rikima/spark,WeichenXu123/spark,hvanhovell/spark,mdespriee/spark,cin/spark,panfengfeng/spark,vinodkc/spark,SnappyDataInc/spark,someorz/spark,hvanhovell/spark,yanboliang/spark,jlopezmalla/spark,apache-spark-on-k8s/spark,xflin/spark,techaddict/spark,ddna1021/spark,liutang123/spark,spark-test/spark,taroplus/spark,shuangshuangwang/spark,big-pegasus/spark,guoxiaolongzte/spark,sachintyagi22/spark,nilsgrabbert/spark,liutang123/spark,1haodian/spark,zhouyejoe/spark,kiszk/spark,facaiy/spark,bOOm-X/spark,saturday-shi/spark,dongjoon-hyun/spark,JerryLead/spark,jrshust/spark,narahari92/spark,Panos-Bletsos/spark-cost-model-optimizer,patrick-nicholson/spark,loneknightpy/spark,patrick-nicholson/spark,saturday-shi/spark,publicRoman/spark,zuotingbing/spark,sachintyagi22/spark,SHASHANKB/spark,shubhamchopra/spark,UndeadBaneGitHub/spark,sahilTakiar/spark,byakuinss/spark,ptkool/spark,apache-spark-on-k8s/spark,rednaxelafx/apache-spark,mzl9039/spark,ConeyLiu/spark,ericvandenbergfb/spark,rikima/spark,apache/spark,milliman/spark,shubhamchopra/spark,alunarbeach/spark,goldmedal/spark,zuotingbing/spark,zuotingbing/spark,zhouyejoe/spark,pgandhi999/spark,holdenk/spark,liyichao/spark,caneGuy/spark,SnappyDataInc/spark,rekhajoshm/spark,jianran/spark,holdenk/spark,nlalevee/spark,shubhamchopra/spark,zero323/spark,WeichenXu123/spark,sahilTakiar/spark,darionyaphet/spark,szhem/spark,aray/spark,sahilTakiar/spark,eyalfa/spark,zuotingbing/spark,WindCanDie/spark,zuotingbing/spark,mzl9039/spark,liutang123/spark,apache-spark-on-k8s/spark,guoxiaolongzte/spark,ahnqirage/spark,taroplus/spark,saltstar/spark,szhem/spark,cloud-fan/spark,huang1900/spark,kissmetrics/spark,Panos-Bletsos/spark-cost-model-optimizer,ptkool/spark,bravo-zhang/spark,publicRoman/spark,yanboliang/spark,metamx/spark,bravo-zhang/spark,shaneknapp/spark,panfengfeng/spark,apache-spark-on-k8s/spark,caneGuy/spark,sachintyagi22/spark,debugger87/spark,HyukjinKwon/spark,markhamstra/spark,ddna1021/s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